This is the 196th most frequent Finnish word.
kaikki
"Kaikki" means "all" or "everything" in English.
In this sentence, 'kaikki' functions as a pronoun meaning 'everyone'.
Kaikki ovat valmiita lähtemään.
Everyone is ready to leave.
Here, 'kaikki' is used as an adjective meaning 'all' to describe the scope of the tasks.
Sinun tulee tehdä kaikki tehtävät huolellisesti.
You must complete all the tasks carefully.
In this case, 'kaikki' serves as a pronoun meaning 'everything', referring to the entirety of the perspective.